We-e-ll, thing is, what does an agent DO that you can't, really? There are internet sites out there you can advertise your property (and who will give you advice about how to 'market' your property). Or you can set your own website up with pictures etc, then advertise the site in the local press, on a sign outside etc.
As for the emotional and personal, I was amazed at how often when we were looking to buy recently here in the UK the owner of the house was expected to show us around themselves! Or the number of times the owner trailed around the house following us and the agent!!
Until recently all my property transactions were in Oz. There, you wouldn't DREAM of having to show a potential buyer around! You as a buyer or seller would expect never to clamp eyes on your other party. The middle-man role is what you pay your agent to do!
fwiw I sold our house in Oz myself. It wasn't hard. The difficult stuff is what one should undertake anyway, whoever is selling, ie serious decluttering, immediate availability, immaculate presentation at all times. ONE (not necessarily you personally, drama!) may think: 'Of course any potential buyer would expect there to be wet towels on the bathroom floor, limescale on the shower cubicle, dirty dishes in the sink, dirty laundry on view, it's a family home' No, no no! Hire storage! Stick 30% of your clobber in it! Make the kids select half a dozen toys and put them in one box apiece. Hide the rest! Wipe the shower down every time you use it!
I didn't allow any actual knocking on the door (though we had a professionally made For Sale sign, listing the features outside) but on more than one occasion I had a phone call from someone sitting outside in their car, requesting a viewing!
Trick was to welcome them, give them a brochure with a few photos and the facts in it, give them a guided tour, pointing out the features, then telling them to go wander alone for 10 minutes or so and tell them where to find you when they were ready. I also said 'You don't need to whisper or be afraid of saying openly what you don't like, I'm not precious about this, it's a house I want to sell'. That way they realised that though I owned the house, I would be as professional as any agent. Then, in 'the chat' at the end, I'd say I was going to effectively split the profit of NOT using and agent 50/50 with them.
Not sure how you go with the legals here- it was easier in Oz, you got a contract prepared which they signed. Ask a solicitor how to 'nail' a buyer.
Anyway, took me 10 days from advert to exchange